Aortic Remodeling Following Sun's Procedure for Acute Type A Aortic Dissection

Area of Science:

• Cardiovascular Surgery
• Vascular Surgery
• Medical Imaging

Background:

• Sun's procedure is a common surgical technique for type A aortic dissection.
• Acute Stanford type A aortic dissection extending to the iliac bifurcation requires specific surgical considerations.

Purpose of the Study:

• To evaluate clinical outcomes and morphologic changes in the true and false lumens after Sun's procedure.
• To analyze aortic remodeling patterns using computed tomography (CT) angiography.

Main Methods:

• Retrospective review of 51 patients undergoing Sun's procedure for acute Stanford type A aortic dissection.
• CT angiography analysis of preoperative and follow-up (1, 3, 6 months) images to measure lumen dimensions.
• Assessment of true and false lumen area and diameter changes.

Main Results:

• In-hospital mortality rate was 10.6% (5/47 eligible patients).
• Ascending aorta: False lumen eliminated, true lumen unchanged.
• Descending aorta: Significant increase in true lumen dimensions and significant decrease in false lumen dimensions by 6 months, with progressive thrombosis.
• Abdominal aorta: Significant decrease in false lumen dimensions by 6 months, with delayed remodeling compared to the descending aorta.

Conclusions:

• Aortic remodeling after Sun's procedure is a continuous and predictable process.
• The extent and timing of aortic remodeling vary by aortic level, with earlier changes in the descending thoracic aorta compared to the abdominal aorta.